This domain is found in proteins from vertebrates. It shows three alpha-helices, one of them functioning as a recognition helix [1.2].

1: Mechanism of c-Myb-C/EBP beta cooperation from separated sites on a promoter. Tahirov TH, Sato K, Ichikawa-Iwata E, Sasaki M, Inoue-Bungo T, Shiina M, Kimura K, Takata S, Fujikawa A, Morii H, Kumasaka T, Yamamoto M, Ishii S, Ogata K; Cell. 2002;108:57-70. PMID:11792321

2: Solution structure of a specific DNA complex of the Myb DNA-binding domain with cooperative recognition helices. Ogata K, Morikawa S, Nakamura H, Sekikawa A, Inoue T, Kanai H, Sarai A, Ishii S, Nishimura Y; Cell. 1994;79:639-648. PMID:7954830